得意忘形

dé yì wàng xíng

carried away by success

Character by character

得dé
get

意yì
wish

忘wàng
forget

形xíng
form

刚赚了点钱，他就得意忘形了。

He’d barely made any money before it went to his head.

Tone: negative (criticism).

A warning not to lose your head when things go well.

Learn it in context

This idiom and thousands more are in Learn Chinese with Bao, with audio, pinyin and drills that make them stick.